Li Lei isn’t ____ Liu Ming. 

【There’s a lot of water on the ground; the water pipe _____ be repaired. 

Doctor Wang      at seven o’clock for the conference, but she didn’t turn up. 

Here are some apples. You _________ take any one if you like.

--- I once got lost during my first visit to Beijing.-- Oh, did you? You _______ me as your guide.